Remove -Wno-unused-private-field clang warning suppression.

content/browser/renderer_host/media/video_capture_buffer_pool.cc

Index: content/browser/renderer_host/media/video_capture_buffer_pool.cc
diff --git a/content/browser/renderer_host/media/video_capture_buffer_pool.cc b/content/browser/renderer_host/media/video_capture_buffer_pool.cc
index f9f83907120d73bf66e931af2d473dd110113b51..0d68b20eee44cdc8b094e68e1aba7b557b69b189 100644
--- a/content/browser/renderer_host/media/video_capture_buffer_pool.cc
+++ b/content/browser/renderer_host/media/video_capture_buffer_pool.cc
@@ -19,7 +19,11 @@ const int VideoCaptureBufferPool::kInvalidId = -1;
 class SimpleBufferHandle final : public VideoCaptureBufferPool::BufferHandle {
  public:
   SimpleBufferHandle(void* data, size_t size, base::SharedMemoryHandle handle)
-      : data_(data), size_(size), handle_(handle) {}
+      : data_(data),
+#if defined(OS_POSIX)
+        handle_(handle),
+#endif
+        size_(size) {}
   ~SimpleBufferHandle() override {}
 
   size_t size() const override { return size_; }
@@ -37,8 +41,10 @@ class SimpleBufferHandle final : public VideoCaptureBufferPool::BufferHandle {
 
  private:
   void* const data_;
-  const size_t size_;
+#if defined(OS_POSIX)
   const base::SharedMemoryHandle handle_;

[Nico, 2015/07/09 01:58:16]

nit: It's strange to have data_ and size_ not next to each other (I get that the
ifdef is a bit nicer this way, but meh)

[benwells, 2015/07/09 11:43:02]

Done.

+#endif
+  const size_t size_;
 };
 
 // A holder of a GpuMemoryBuffer-backed buffer, Map()ed on ctor and Unmap()ed on